In medio Ecclesiae aperuit os ejus: et implevit eum Dominus spiritu sapientiae et intellectus: stolam gloriae induit eum. * Bonum est confiteri Domino: et psallere nomini tuo, Altissime.
In the midst of the Church the Lord opened his mouth: and He filled him with the spirit of wisdom and understanding: He clothed him with a robe of glory. * It is good to give praise to the Lord: and to sing to Thy name, O most High.
(Ecclesiasticus 15:5 and Psalm 91:2 from the Introit of Mass)
O God, who didst give unto Thy people blessed Gregory to be a minister of eternal salvation: grant, we beseech Thee, that we may be worthy to have as an intercessor in heaven him, whom we have had as teacher of life on earth.
From the Catholic Encyclopaedia: http://www.newadvent.org/cathen/07010b.htm